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Someday computers may be able to see "forms", just as they [#permalink]

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14 Jan 2004, 11:37

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Someday computers may be able to see "forms", just as they now can be made to recongnize voices, a problem of perception similar to that of artifical vision but {it has/one that has} proved easier to solve.

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14 Jan 2004, 11:56

one that has sounds better.
I cannot explain it confidently. This is what I thought.

Part of the sentence can be structured as "a problem of perception, similar to that of artifical vision, that has proved easier to solve.So "that" is required here. Other than this the sentence has punctuation problems.

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Let me ask you this first: does "one that has proved easier to solve" sound absurd? It seems as though the problem has proved something!

Should it not be "one that has been proved easier to solve"?

Keeping that aside for a moment: I think this sentence is a coordination/subordination problem. "it has" will make the following clause a coordinate whereas "one that has" will make it subordinate?

I feel like shooting arrows in the dark!

The answer is indeed "one that has".

I agree with you. You might want to change "that has been proved" to "that has been proven". Then again we choose best of available answers in GMAT, and not necessarily the grammatically correct answer.